if they open the door to anyone who is not law enforcement, they are subject to arrest and paroled sex offenders who live on the street will be rounded up and taken into a state facility during trick or treat hours tonight. >> we'll provide them access to the clinic, dog training and drug treatment program. they will receive instruction that evening. >> about 6500 sex offenders are on parole here in california and they have to follow these special halloween rules. >>> a san mateo elementary school employee faces charges for allegedly touching a young girl inappropriately. anne makovec is live outside the school with why authorities believe there may be more victims. anne. >> reporter: they are asking parents here at horrall elementary school school, the guy at the school had access to a lot of children. >> oh, my god. that's scary. it's scary because i'm -- i know they are not going to happen over here. >> reporter: police say an after-school child care aide is accused of inappropriately touching a girl at horrall elementary. they say eric michael renz befriended and violated the girl.